Posted by rocksea on 09 Dec 2013
Crimson marsh gliders are crimson, and frequent visitors to marshlands.
Well, it is the male who is crimson, and the female (below) adorns totally different colors.
Why do the male crimsons have its bright color? Pruinescence, as it is called, is the dusty bright coloration of the dragonfly’s outer shell (cuticle). This is due to the property of the particles on the cuticle which might be scattering some colors more than others – tyndall scattering.
Different reasons are attributed to the pruinescence in dragonflies. Among some dragonflies, males display the pruinescence to other males as a territorial threat. A few others use pruinescence to recognize members of their own species or to cool their bodies by reflecting radiation away. Though many dragonflies have their pruinescence on the back of their abdomen, in some species it may cover almost the whole body, and often increases its intensity and extent with age.
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